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Webber DM, Tishchenko V, Peng Q, Battu S, Carey RM, Chitwood DB, Crnkovic J, Debevec PT, Dhamija S, Earle W, Gafarov A, Giovanetti K, Gorringe TP, Gray FE, Hartwig Z, Hertzog DW, Johnson B, Kammel P, Kiburg B, Kizilgul S, Kunkle J, Lauss B, Logashenko I, Lynch KR, McNabb R, Miller JP, Mulhauser F, Onderwater CJG, Phillips J, Rath S, Roberts BL, Winter P, Wolfe B. Measurement of the positive muon lifetime and determination of the Fermi constant to part-per-million precision. PHYSICAL REVIEW LETTERS 2011; 106:041803. [PMID: 21405320 DOI: 10.1103/physrevlett.106.041803] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/05/2010] [Indexed: 05/30/2023]
Abstract
We report a measurement of the positive muon lifetime to a precision of 1.0 ppm; it is the most precise particle lifetime ever measured. The experiment used a time-structured, low-energy muon beam and a segmented plastic scintillator array to record more than 2×10(12) decays. Two different stopping target configurations were employed in independent data-taking periods. The combined results give τ(μ(+)) (MuLan)=2 196 980.3(2.2) ps, more than 15 times as precise as any previous experiment. The muon lifetime gives the most precise value for the Fermi constant: G(F) (MuLan)=1.166 378 8(7)×10(-5) GeV(-2) (0.6 ppm). It is also used to extract the μ(-)p singlet capture rate, which determines the proton's weak induced pseudoscalar coupling g(P).
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Peng Q, Holland SE, Choong WS, Budinger TF, Moses WW. Real-time quantitative ex vivo direct autoradiography with 10 μm pixel resolution. ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY. ANNUAL INTERNATIONAL CONFERENCE 2011; 2011:6273-6276. [PMID: 22255772 DOI: 10.1109/iembs.2011.6091548] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
We present three new autoradiography methods to map positron emission rate of a bio-specimen slice with high resolution. One is based on LBNL scientific charge coupled device (CCD) and the other two are based on conventional CCDs. High conversion efficiency (100k e-h pairs / 0.5 MeV positron) and low dark current (1.75 × 10(-4) e-/pix/sec) can be achieved using the LBNL CCD. The theoretical calculations and preliminary experiments show that an 86 μm spatial resolution can be achieved when imaging a 100 μm thick tissue soaked with (18)F which produce higher energy positron. The main disadvantage of the LBNL CCD we tested is that a very low operating temperature is required to eliminate dark current. This dramatically increases the system cost. In addition, the integration time of the CCD needs to be short enough to avoid overlapping of the positron trajectories. Conventional CCDs have lower conversion efficiency (2k e-h pairs / 0.5 MeV positron) and higher dark current (200 e-/pix/sec), but are more cost-efficient and the requirement for the readout frequency is much lower. The conversion efficiency of the conventional CCD imager can be improved by 17 times by inserting a 100 μm layer of phosphor between the sample and the imager. However, the light emitted from the phosphor screen will be ~100 μm diameter, which severely degrades the spatial resolution. A high readout frequency is also required to avoid the overlapping. The CCD systems designed in this study will be used to map positron emission rate of bio-specimens such as cancerous tissues acquired in regular biopsy procedure. They can also be used to corroborate tracer kinetic modeling at a cellular level.
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103
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Xianghua F, Peng Q, Yanbo W, Xuechao W, Shiqiang L, Weize F, Yunfa J. e0456 Relationship between hypokalaemia at the early stage of acute myocardial infarction and malignant ventricular arrhythmia. BRITISH HEART JOURNAL 2010. [DOI: 10.1136/hrt.2010.208967.456] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Xianghua F, Peng Q, Yanbo W, Yanbo W, Shiqiang L, Weize F, Yunfa J. e0634 The relationship between hypokalaemia at the early stage of acute myocardial infarction and malignant ventricular arrhythmia. BRITISH HEART JOURNAL 2010. [DOI: 10.1136/hrt.2010.208967.634] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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105
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Peng Q, Su H, Xie T, Hong DZ, Wu QH, Cheng XS. e0610 The Changes of B-type natriuretic peptide in chronic heart failure patients with diabetes mellitus. BRITISH HEART JOURNAL 2010. [DOI: 10.1136/hrt.2010.208967.610] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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106
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Xue S, Lyu Q, Peng Q, Cao S, Zhou Y, Kuang Y. Vitrification yields superior efficiency of human cleavage-stage embryo cryopreservation versus slow-freezing. Fertil Steril 2010. [DOI: 10.1016/j.fertnstert.2010.07.486] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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107
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Seiler MJ, Aramant RB, Thomas BB, Peng Q, Sadda SR, Keirstead HS. Visual restoration and transplant connectivity in degenerate rats implanted with retinal progenitor sheets. Eur J Neurosci 2010; 31:508-20. [PMID: 20105230 PMCID: PMC2875871 DOI: 10.1111/j.1460-9568.2010.07085.x] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
The aim of this study was to determine whether retinal progenitor layer transplants form synaptic connections with the host and restore vision. Donor retinal sheets, isolated from embryonic day 19 rat fetuses expressing human placental alkaline phosphatase (hPAP), were transplanted to the subretinal space of 18 S334ter-3 rats with fast retinal degeneration at the age of 0.8-1.3 months. Recipients were killed at the age of 1.6-11.8 months. Frozen sections were analysed by confocal immunohistochemistry for the donor cell label hPAP and synaptic markers. Vibratome slices were stained for hPAP, and processed for electron microscopy. Visual responses were recorded by electrophysiology from the superior colliculus (SC) in 12 rats at the age of 5.3-11.8 months. All recorded transplanted rats had restored or preserved visual responses in the SC corresponding to the transplant location in the retina, with thresholds between -2.8 and -3.4 log cd/m(2). No such responses were found in age-matched S334ter-3 rats without transplants, or in those with sham surgery. Donor cells and processes were identified in the host by light and electron microscopy. Transplant processes penetrated the inner host retina in spite of occasional glial barriers between transplant and host. Labeled neuronal processes were found in the host inner plexiform layer, and formed apparent synapses with unlabeled cells, presumably of host origin. In conclusion, synaptic connections between graft and host cells, together with visual responses from corresponding locations in the brain, support the hypothesis that functional connections develop following transplantation of retinal layers into rodent models of retinal degeneration.
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108
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Peng Q, Shi BE. The changing disparity energy model. Vision Res 2009; 50:181-92. [PMID: 19925822 DOI: 10.1016/j.visres.2009.11.012] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2009] [Revised: 10/19/2009] [Accepted: 11/12/2009] [Indexed: 11/18/2022]
Abstract
Changing disparity is a possible cue for stereomotion perception. We propose the changing disparity energy model, a physiologically plausible model for neurons tuned to changing disparity. This model combines the disparity and motion energy models commonly used to model cortical neuron outputs. The model outputs are consistent with psychophysical experiments indicating that stereomotion speed discrimination thresholds for dynamic random dot stereograms are higher than for random dot stereograms. Thus, these experimental results are not necessarily strong evidence for the existence of an inter-ocular velocity difference cue. The model also predicts a relationship between the speed discrimination threshold ratio and the dot density.
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Moses WW, Buckley S, Vu C, Peng Q, Pavlov N, Choong WS, Wu J, Jackson C. OpenPET: A Flexible Electronics System for Radiotracer Imaging. IEEE TRANSACTIONS ON NUCLEAR SCIENCE 2009; 2009:3491-3495. [PMID: 21297894 PMCID: PMC3033039 DOI: 10.1109/nssmic.2009.5401797] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
We present the design for OpenPET, an electronics readout system designed for prototype radiotracer imaging instruments. The critical requirements are that it has sufficient performance, channel count, channel density, and power consumption to service a complete camera, and yet be simple, flexible, and customizable enough to be used with almost any detector or camera design. An important feature of this system is that each analog input is processed independently. Each input can be configured to accept signals of either polarity as well as either differential or ground referenced signals. Each signal is digitized by a continuously sampled ADC, which is processed by an FPGA to extract pulse height information. A leading edge discriminator creates a timing edge that is "time stamped" by a TDC implemented inside the FPGA. This digital information from each channel is sent to an FPGA that services 16 analog channels, and information from multiple channels is processed by this FPGA to perform logic for crystal lookup, DOI calculation, calibration, etc. As all of this processing is controlled by firmware and software, it can be modified / customized easily. The system is open source, meaning that all technical data (specifications, schematics and board layout files, source code, and instructions) will be publicly available.
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110
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Chen YG, Cui XL, Wang YX, Tang SK, Zhang YQ, Li WJ, Liu JH, Peng Q, Xu LH. Psychroflexus sediminis sp. nov., a mesophilic bacterium isolated from salt lake sediment in China. Int J Syst Evol Microbiol 2009; 59:569-73. [DOI: 10.1099/ijs.0.003269-0] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
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111
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Chen YG, Cui XL, Zhang YQ, Li WJ, Wang YX, Xu LH, Wen ML, Peng Q, Jiang CL. Paraliobacillus quinghaiensis sp. nov., isolated from salt-lake sediment in China. Int J Syst Evol Microbiol 2009; 59:28-33. [DOI: 10.1099/ijs.0.65735-0] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
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112
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Chen YG, Cui XL, Zhang YQ, Li WJ, Wang YX, Xu LH, Peng Q, Wen ML, Jiang CL. Gracilibacillus halophilus sp. nov., a moderately halophilic bacterium isolated from saline soil. Int J Syst Evol Microbiol 2008; 58:2403-8. [DOI: 10.1099/ijs.0.65698-0] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
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113
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Peng Q, Zhou A, Ding Y. TU-D-332-02: Abdominal Fat Quantification Accuracy Using Water Saturated B-SSFP MRI Sequences: A Verification Study. Med Phys 2008. [DOI: 10.1118/1.2962593] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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114
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Zhang B, Ren J, Yan X, Huang X, Ji H, Peng Q, Zhang Z, Huang L. Investigation of the porcine MUC13 gene: isolation, expression, polymorphisms and strong association with susceptibility to enterotoxigenic Escherichia coli F4ab/ac. Anim Genet 2008; 39:258-66. [DOI: 10.1111/j.1365-2052.2008.01721.x] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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115
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Bennett GW, Bousquet B, Brown HN, Bunce G, Carey RM, Cushman P, Danby GT, Debevec PT, Deile M, Deng H, Deninger W, Dhawan SK, Druzhinin VP, Duong L, Efstathiadis E, Farley FJM, Fedotovich GV, Giron S, Gray FE, Grigoriev D, Grosse-Perdekamp M, Grossmann A, Hare MF, Hertzog DW, Huang X, Hughes VW, Iwasaki M, Jungmann K, Kawall D, Kawamura M, Khazin BI, Kindem J, Krienen F, Kronkvist I, Lam A, Larsen R, Lee YY, Logashenko I, McNabb R, Meng W, Mi J, Miller JP, Mizumachi Y, Morse WM, Nikas D, Onderwater CJG, Orlov Y, Ozben CS, Paley JM, Peng Q, Polly CC, Pretz J, Prigl R, zu Putlitz G, Qian T, Redin SI, Rind O, Roberts BL, Ryskulov N, Sedykh S, Semertzidis YK, Shagin P, Shatunov YM, Sichtermann EP, Solodov E, Sossong M, Steinmetz A, Sulak LR, Timmermans C, Trofimov A, Urner D, von Walter P, Warburton D, Winn D, Yamamoto A, Zimmerman D. Search for Lorentz and CPT violation effects in Muon spin precession. PHYSICAL REVIEW LETTERS 2008; 100:091602. [PMID: 18352695 DOI: 10.1103/physrevlett.100.091602] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2007] [Indexed: 05/26/2023]
Abstract
The spin precession frequency of muons stored in the (g-2) storage ring has been analyzed for evidence of Lorentz and CPT violation. Two Lorentz and CPT violation signatures were searched for a nonzero delta omega a(=omega a mu+ - omega a mu-) and a sidereal variation of omega a mu+/-). No significant effect is found, and the following limits on the standard-model extension parameters are obtained: bZ = -(1.0+/-1.1) x 10(-23) GeV; (m mu dZ0 + HXY)=(1.8+/-6.0) x 10(-23) GeV; and the 95% confidence level limits b perpendicular mu+ <1.4 x 10(-24) GeV and b perpendicular mu- <2.6 x 10(-24) GeV.
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Hu M, Wang J, Peng Q. Identification and visualization of cage-shaped proteins. Bioinformatics 2007; 23:3400-2. [DOI: 10.1093/bioinformatics/btm476] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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117
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Wang Y, Ren J, Lan L, Yan X, Huang X, Peng Q, Tang H, Zhang B, Ji H, Huang L. Characterization of polymorphisms of transferrin receptor and their association with susceptibility to ETEC F4ab/ac in pigs. J Anim Breed Genet 2007; 124:225-9. [PMID: 17651325 DOI: 10.1111/j.1439-0388.2007.00664.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
Abstract
Diarrhoea caused by enterotoxigenic Escherichia coli (ETEC) expressing F4 (F4ab, F4ac and F4ad) fimbriae is a significant cause of mortality and morbidity in newborn and weaned pigs. The locus controlling susceptibility towards ETEC F4ab/ac has been mapped to SSC13q41, in which TFRC (transferrin receptor) was localized and considered as a positional candidate gene for ETEC F4ab/ac receptor. In this study, we determined susceptibility/resistance to ETEC F4ab/ac in a total of 755 F2 animals from a White Duroc x Erhualian intercross using a microscopic enterocyte adhesion assay. We identified two TFRC polymorphisms (SNPs 591 A>G and 632 A>G) in a single exon after comparative sequencing analysis of 2371-bp amplicons containing the complete coding region of TFRC using RNA of eight full-sib F2 animals with susceptible and resistant phenotypes. The intron sequences flanking the two exon polymorphisms were obtained, revealing an intron polymorphism (SNP 291 C>T). We genotyped the 19 founder animals of the White Duroc x Erhualian intercross for the identified polymorphisms, showing that only the 291 C>T polymorphism is a highly informative marker. We further genotyped all 59 F1 and 755 F2 animals for the 291 C>T polymorphism, and the association of this polymorphism with susceptibility/resistance to ETEC F4ab/ac in these F2 animals was evaluated by the transmission disequilibrium test. The result showed that the 291 C>T polymorphism is not a causal mutation, however, has a significant linkage disequilibrium with the ETEC F4ab/ac, especially F4ac receptor locus.
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Wang LJ, Peng Q, Li QK, Shuai Z. Roles of inter- and intramolecular vibrations and band-hopping crossover in the charge transport in naphthalene crystal. J Chem Phys 2007; 127:044506. [PMID: 17672706 DOI: 10.1063/1.2751191] [Citation(s) in RCA: 89] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
We calculate the hole and electron mobilities in naphthalene crystal from 10 to 300 K within the framework of the Holstein-Peierls model coupled with first-principles density-functional-theory-projected tight-binding band structures. All the electron-phonon coupling constants, including both local and nonlocal parts for inter- and intramolecular vibrations, have been taken into considerations through density functional theory. The band-hopping crossover transition temperature for the electron transport in the c' axis is calculated to be around 23 K. We have identified a few high frequency intramolecular vibrations which are very important to the charge transport in naphthalene crystal due to their comparatively large electron-phonon coupling constants. However, their contributions to the temperature dependence of mobility are minor because of the small phonon occupations and small nonlocal coupling strengths. The low frequency intermolecular modes (longitudinal optical modes) are found to be the major contributions to the temperature dependent charge transfer properties in naphthalene crystal. Even though the calculated qualitative temperature dependence is in agreement with experiment, the predicted absolute mobility is about one to two orders of magnitude larger.
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Chitwood DB, Banks TI, Barnes MJ, Battu S, Carey RM, Cheekatmalla S, Clayton SM, Crnkovic J, Crowe KM, Debevec PT, Dhamija S, Earle W, Gafarov A, Giovanetti K, Gorringe TP, Gray FE, Hance M, Hertzog DW, Hare MF, Kammel P, Kiburg B, Kunkle J, Lauss B, Logashenko I, Lynch KR, McNabb R, Miller JP, Mulhauser F, Onderwater CJG, Ozben CS, Peng Q, Polly CC, Rath S, Roberts BL, Tishchenko V, Wait GD, Wasserman J, Webber DM, Winter P, Zołnierczuk PA. Improved measurement of the positive-muon lifetime and determination of the Fermi constant. PHYSICAL REVIEW LETTERS 2007; 99:032001. [PMID: 17678280 DOI: 10.1103/physrevlett.99.032001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/14/2007] [Indexed: 05/16/2023]
Abstract
The mean life of the positive muon has been measured to a precision of 11 ppm using a low-energy, pulsed muon beam stopped in a ferromagnetic target, which was surrounded by a scintillator detector array. The result, tau(micro)=2.197 013(24) micros, is in excellent agreement with the previous world average. The new world average tau(micro)=2.197 019(21) micros determines the Fermi constant G(F)=1.166 371(6)x10(-5) GeV-2 (5 ppm). Additionally, the precision measurement of the positive-muon lifetime is needed to determine the nucleon pseudoscalar coupling g(P).
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Dumoulin C, Peng Q, Stodkilde-Jorgensen H, Shishido K, Constantinou C. Changes in levator ani anatomical configuration following physiotherapy in women with stress urinary incontinence. J Urol 2007; 178:970-7; quiz 1129. [PMID: 17632130 DOI: 10.1016/j.juro.2007.05.023] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2007] [Indexed: 11/23/2022]
Abstract
PURPOSE We quantified the effect of pelvic floor muscle training on the anatomical configuration of the levator ani using magnetic resonance imaging. MATERIALS AND METHODS Five female participants with stress urinary incontinence underwent magnetic resonance imaging before and after participating in a pelvic floor muscle physiotherapy program. Axial T1-weighted images of the levator ani were taken with the participant in a supine position. Source images were then manually segmented and surface modeling was applied to build a 3-dimensional model of the levator ani. Models were then measured to determine the levator ani surface area as well as the encircled volume at rest and during voluntary contraction. The percentage of levator ani retraction and symphysis pubis movement during voluntary contraction before and after physiotherapy were also measured. RESULTS After physiotherapy the levator ani surface area at rest was significantly smaller than before physiotherapy, decreasing from 677.11 +/- 45.00 to 620.48 +/- 36.14 mm(2) (p = 0.04). The relative reduction in volume encircled by the levator ani during contraction increased significantly from -11.66 +/- 7.42 to -26.02 +/- 13.52 mm(3) (p = 0.04). Levator ani surface retraction during a voluntary contraction increased significantly from 65.61% +/- 17.07% to 81.70% +/- 16.30% (p = 0.02). Symphysis pubis movement during pelvic floor muscle contraction decreased from 1.45 +/- 1.32 to 0.44 +/- 0.61 mm (p = 0.05). CONCLUSIONS Findings from this preliminary study indicate that pelvic floor muscle training results in anatomical changes in the levator ani and reduction of pubic movement. These results provide insight into the possible anatomical mechanisms through which physiotherapy enables the pelvic floor muscle to minimize urine leakage.
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Peng Q, Dornbluth C, Kist K, Otto P. SU-FF-I-80: Comparison of Artifact Size Caused by Metallic Tissue Marking Clips at 1.5T and 3T Breast MRI: A Phantom Study. Med Phys 2007. [DOI: 10.1118/1.2760457] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Cunderlíková B, Wahlqvist R, Berner A, Vasovic V, Warloe T, Nesland JM, Peng Q. Detection of urinary bladder cancer with flow cytometry and hexaminolevulinate in urine samples. Cytopathology 2007; 18:87-95. [PMID: 17397493 DOI: 10.1111/j.1365-2303.2007.00436.x] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
OBJECTIVES Urinary bladder urothelial carcinoma is diagnosed by a combination of cystoscopy and biopsy, with cytology as a valuable additional technique. The accuracy of cytological diagnosis depends on the experience of the cytologist and can inevitably vary from one cytologist to another. There is a need for an easy, reliable and objective diagnostic method. In the present study a new method was designed for the detection of bladder cancer cells in urine. METHODS Flow cytometry was utilized to detect protoporphyrin IX in an artificial model consisting of normal urinary bladder transitional epithelial cells (NBECs) from healthy volunteers' urine and an established human urinary bladder carcinoma cell line, TCCSUP, after incubation with hexaminolevulinate (HAL). In addition, urine samples from 19 patients with histopathologically confirmed superficial bladder cancer were examined. RESULTS Incubation of NBECs or TCCSUP cells with HAL for 1 hour resulted in production of protoporphyrin IX only in the TCCSUP cells. Incubation of a mixture of NBECs and TCCSUP cells with HAL gave rise to a separated subpopulation of cells with protoporphyrin IX fluorescence. After cell sorting by flow cytometry the protoporphyrin IX-containing subpopulation of cells was confirmed as TCCSUP cells on cytological examination. It was possible to detect 5% TCCSUP cells in the mixture of NBECs/TCCSUP cells. To test the feasibility of the method in clinica diagnosis, urine samples from patients with bladder cancer were also measured with comparable, although preliminary and limited, results to those of cytological examination. CONCLUSIONS The preliminary results show that the technique may be feasible for the detection of bladder cancer cells in urine with possible advantages of simplicity, reliability and objectivity.
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Abla G, Flanagan S, Peng Q, Burruss J, Schissel D. Advanced tools for enhancing control room collaborations. FUSION ENGINEERING AND DESIGN 2006. [DOI: 10.1016/j.fusengdes.2006.04.059] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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124
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Crosswell HE, Peng Q, Prince C, De P, Durden DL. Targeting PI3K in alveolar rhabdomyosarcoma (aRMS). J Clin Oncol 2006. [DOI: 10.1200/jco.2006.24.18_suppl.10025] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
10025 Background: aRMS is a pediatric solid tumor with a poor prognosis despite aggressive therapy. HGF/c-Met & PTEN-PI3K-AKT pathways are aberrant, leading to aRMS growth & metastasis. We hypothesize that recapitulating the tumor suppressor (TS) function of PTEN with small molecular inhibitors (SMIs) may control aRMS. SMIs of HGF/c-Met & PI3K pathways were examined for their control of aRMS growth & migration. Design/Methods: Pax3/fkhr-associated aRMS cells, RH30, were infected with MIEG3/PTEN (RH30MP1), MIEG3 retroviral vector (RH30MV1) or CMV-driven luciferase (RH30Luc). Migration was assessed by a transwell migration chamber; proliferation with a MTT assay; biochemical analysis by Western blot. Tumor growth and spontaneous lung metastasis in IACUC-approved animal experiments, in which cell lines were injected s.c. in nude mice, were analysed by bioluminescent imaging (BLI) or by direct measurements. Students t-test (p<.05) determined significance. Results: Western analysis revealed RH30 cells have low PTEN, high levels of c-Met & p-AKT. HGF stimulation of RH30 cells results in increased p-Met, p-Akt & p-Erk1/2 levels, correlating with enhanced migration and proliferation (<.001). SMI of PI3K (LY294002) controls RH30 proliferation (p<.01), not migration; c-Met (PHA665752) & MAPK (PD98059) SMIs stop HGF-directed migration through control of p-Erk levels (p<.01). PTEN induction in RH30 cells via PPAR-gamma agonist, rosiglitazone, results in decreased basal p-Akt levels. RH30 cells with stable, retroviral-infected PTEN have significantly reduced migration& proliferation as compared to cells with vector alone (p<.001). In nude mice xenograft models, PTEN & novel PI3K SMI, SF1126 at 50mg/kg, control RH30 tumoriginesis. SF1126 also controls spontaneous RH30Luc metastasis to the lungs. Conclusions: High c-Met-expressing RH30 cells are sensitive to HGF-stimulated migration through MAPK & proliferation via PI3K. PTEN’s control of aRMS migration, proliferation & tumorigenesis suggests that PTEN controls both PI3K & MAPK. Novel PI3K inhibitor, SF1126, controls tumor growth in vivo & prevents spontaneous lung metastasis. Recapitulating PTEN TS function with SF1126 alone or in combination with SMIs of the HGF/c-Met or MAPK may benefit patients with aRMS & deserves further pre-clinical study. [Table: see text]
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Zhang H, Zhu C, Peng Q, Chen J. Using geometric algebra for 3D linear transformations. Comput Sci Eng 2006. [DOI: 10.1109/mcse.2006.54] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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126
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Constantinou C, Peng Q, Jones R, Perkash I, Murayama Y, Omata S. Dynamics of pelvic floor function. J Biomech 2006. [DOI: 10.1016/s0021-9290(06)84380-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Ye X, Shi L, Cheng Y, Peng Q, Huang S, Liu J, Huang M, Peng B, Bian Z. A novel locus for autosomal dominant hereditary gingival fibromatosis, GINGF3, maps to chromosome 2p22.3-p23.3. Clin Genet 2005; 68:239-44. [PMID: 16098013 DOI: 10.1111/j.1399-0004.2005.00488.x] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Hereditary gingival fibromatosis (HGF) is a rare, benign disorder characterized by slowly progressive fibrous overgrowth of the gingiva. To date, two loci have been mapped in familial cases with autosomal dominant non-syndromic HGF: GINGF (MIM 135300) on chromosome 2p21-p22 and GINGF2 (MIM 605544) on chromosome 5q13-q22. Of the two loci, only SOS1 (son of sevenless one, MIM 182530) gene underlying GINGF locus has been identified. Ascertainment of a large Chinese family has allowed the mapping of a novel locus to 2p22.3-p23.3, GINGF3. Haplotype construction and analysis localized the new locus to an 11.4-cM interval between markers D2S2221 (telomeric) and D2S1788 (centromeric). The maximum two-point limit of detection (LOD) score of 3.45 (theta=0) and multipoint LOD score of 5.00 for marker D2S390 strongly supported linkage to this region. Thus, this genetic interval is distal to and does not overlap with the previously described locus, GINGF, on 2p21-p22.
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128
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Dietze A, Peng Q, Selbo PK, Kaalhus O, Müller C, Bown S, Berg K. Enhanced photodynamic destruction of a transplantable fibrosarcoma using photochemical internalisation of gelonin. Br J Cancer 2005; 92:2004-9. [PMID: 15886704 PMCID: PMC2361782 DOI: 10.1038/sj.bjc.6602600] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Photochemical internalisation (PCI) is a technique for releasing biologically active macromolecules from endocytic vesicles by light activation of a photosensitiser localised in the same vesicles of targeted cells. This study investigated the PCI of the toxin gelonin as a way of enhancing the effect of photodynamic therapy (PDT) on a human malignant fibrous histiocytoma transplanted into nude mice using the photosensitiser disulphonated aluminium phthalocyanine (AlPcS2a). Pharmacokinetic studies after intraperitoneal administration showed that the serum level of AlPcS2a fitted a biexponential model (half-lives of 1.8 and 26.7 h). The tumour concentration was roughly constant up to 48 h, although fluorescence microscopy showed that the drug location was initially mainly vascular, but became intracellular by 48 h. To compare PDT with PCI, 48 h after intraperitoneal injection of 10 mg kg−1 AlPcS2a, and 6 h after direct intratumour injection of 50 μg gelonin (PCI) or a similar volume of phosphate-buffered saline (PDT controls), tumour-bearing animals were exposed to red light (150 J cm−2). Complete response was observed for more than 100 days in 50% of the PCI tumours but only 10% of the PDT tumours (P<0.01). In tumours examined histologically 4 days after light delivery, the depth of necrosis was 3–4 mm after PDT, but 7 mm after PCI. The deeper effect after PCI demonstrates that the light fluence needed to kill tumour is less than with PDT. We conclude that PCI with gelonin can markedly enhance the effect of PDT on this type of tumour and may have a role clinically as an adjunct to surgery to control localised disease.
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MESH Headings
- Animals
- Antineoplastic Agents, Phytogenic/administration & dosage
- Antineoplastic Agents, Phytogenic/pharmacology
- Cytoplasmic Vesicles
- Disease Models, Animal
- Half-Life
- Histiocytoma, Benign Fibrous/drug therapy
- Histiocytoma, Benign Fibrous/veterinary
- Humans
- Indoles/therapeutic use
- Infusions, Parenteral
- Mice
- Mice, Inbred BALB C
- Mice, Nude
- Organometallic Compounds/therapeutic use
- Photochemotherapy/methods
- Photosensitizing Agents/therapeutic use
- Plant Proteins/administration & dosage
- Plant Proteins/pharmacology
- Ribosome Inactivating Proteins, Type 1
- Transplantation, Heterologous
- Treatment Outcome
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129
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Burruss JR, Abla G, Flanagan S, Keahey K, Leggett T, Ludesche C, McCune D, Papka ME, Peng Q, Randerson L, Schissel DP. Developments in Remote Collaboration and Computation. FUSION SCIENCE AND TECHNOLOGY 2005. [DOI: 10.13182/fst05-a787] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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130
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Burruss J, Flanagan S, Keahey K, Ludescher C, McCune D, Peng Q, Randerson L, Schissel D, Thompson M. Remote computing using the National Fusion Grid. FUSION ENGINEERING AND DESIGN 2004. [DOI: 10.1016/j.fusengdes.2004.04.042] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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131
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Bennett GW, Bousquet B, Brown HN, Bunce G, Carey RM, Cushman P, Danby GT, Debevec PT, Deile M, Deng H, Dhawan SK, Druzhinin VP, Duong L, Farley FJM, Fedotovich GV, Gray FE, Grigoriev D, Grosse-Perdekamp M, Grossmann A, Hare MF, Hertzog DW, Huang X, Hughes VW, Iwasaki M, Jungmann K, Kawall D, Khazin BI, Krienen F, Kronkvist I, Lam A, Larsen R, Lee YY, Logashenko I, McNabb R, Meng W, Miller JP, Morse WM, Nikas D, Onderwater CJG, Orlov Y, Ozben CS, Paley JM, Peng Q, Polly CC, Pretz J, Prigl R, Zu Putlitz G, Qian T, Redin SI, Rind O, Roberts BL, Ryskulov N, Semertzidis YK, Shagin P, Shatunov YM, Sichtermann EP, Solodov E, Sossong M, Sulak LR, Trofimov A, von Walter P, Yamamoto A. Measurement of the negative muon anomalous magnetic moment to 0.7 ppm. PHYSICAL REVIEW LETTERS 2004; 92:161802. [PMID: 15169217 DOI: 10.1103/physrevlett.92.161802] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/10/2004] [Indexed: 05/24/2023]
Abstract
The anomalous magnetic moment of the negative muon has been measured to a precision of 0.7 ppm (ppm) at the Brookhaven Alternating Gradient Synchrotron. This result is based on data collected in 2001, and is over an order of magnitude more precise than the previous measurement for the negative muon. The result a(mu(-))=11 659 214(8)(3) x 10(-10) (0.7 ppm), where the first uncertainty is statistical and the second is systematic, is consistent with previous measurements of the anomaly for the positive and the negative muon. The average of the measurements of the muon anomaly is a(mu)(exp)=11 659 208(6) x 10(-10) (0.5 ppm).
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132
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Wu SM, Ren QG, Zhou MO, Peng Q, Chen JY. Protoporphyrin IX production and its photodynamic effects on glioma cells, neuroblastoma cells and normal cerebellar granule cells in vitro with 5-aminolevulinic acid and its hexylester. Cancer Lett 2003; 200:123-31. [PMID: 14568165 DOI: 10.1016/s0304-3835(03)00271-4] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
5-Aminolevulinic acid (ALA) has shown promising in photodynamic detection and therapy of brain tumor. However, the knowledge on selective accumulation of ALA-induced protoporphyrin IX (PpIX) in brain tumor tissue is still fragment. In the present study, the rat C6 glioma cells, human SK-N-SH neuroblastoma cells, and rat normal cerebellar granule cells (RCG) were used to investigate the PpIX production and photocytotoxicity in vitro. The C6 cells and SK-N-SH cells showed a similar kinetics of PpIX accumulation after exposure to ALA or ALA hexyl ester (ALA-H), with an initial increase up to 6-8 h and then saturated. In the case of RCG cells, the PpIX accumulation slowly increased until 12 h studied. However the cellular PpIX content was more than 10 times higher in the C6 and SK-N-SH cells than that in the normal RCG cells. The intracellular localization of PpIX measured by cofocal laser scanning microscopy was in same pattern in the C6 glioma cells and RCG normal cells with a diffuse cytoplasm distribution. The sensitivity of the C6 cells and SK-N-SH cells to ALA or ALA-H PDT was similar. It appears that ALA-H could achieve similar or slightly better results than ALA with respect to PpIX production and photoinactivation of cells, although a 10 times lower concentration of ALA-H was used.
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133
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Chen JY, Peng Q, Jodl HJ. Infrared spectral comparison of 5-aminolevulinic acid and its hexyl ester. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2003; 59:2571-2576. [PMID: 12963453 DOI: 10.1016/s1386-1425(03)00011-8] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
5-aminolevulinic acid (ALA) and its hexyl ester (ALA-H) are bioorganic molecules, now used as drugs in the study and clinical application of photodynamic therapy (PDT). Their infrared spectra were reported in first time here. The spectral characteristic was found well correlated to their structure feature. The strong peaks of C=O, C-H(2) and O-H band were shown in ALA spectrum. While in case of ALA-H, besides the vibration modes of C=O and CH(2) the additional CH(3) infrared peaks appeared, which correspond with their structural difference. Thus the infrared spectrum could be used to detect and distinguish ALA and ALA-H, which have potential for the mechanism study of ALA and ALA-H based PDT in biological system. Using the infrared spectrum as the probe, the thermal effect on structure stability was detected. Below the temperature of 80 degrees C, the ALA and ALA-H are thermally stable in structure. When temperature reached 120 degrees C, the serious structure breaking (thermal decomposition) happened for both ALA and ALA-H.
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134
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Sayers I, Barton S, Rorke S, Sawyer J, Peng Q, Beghé B, Ye S, Keith T, Clough JB, Holloway JW, Sampson AP, Holgate ST. Promoter polymorphism in the 5-lipoxygenase (ALOX5) and 5-lipoxygenase-activating protein (ALOX5AP) genes and asthma susceptibility in a Caucasian population. Clin Exp Allergy 2003; 33:1103-10. [PMID: 12911785 DOI: 10.1046/j.1365-2222.2003.01733.x] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
BACKGROUND 5-Lipoxygenase (5-LO) and 5-lipoxygenase-activating protein (FLAP) are essential for cysteinyl-leukotriene (cys-LT) production, critical mediators in asthma. OBJECTIVE We sought to identify novel promoter polymorphisms within the FLAP (ALOX5AP) gene promoter and test the role of these and the previously identified 5-LO (ALOX5) Sp1 promoter polymorphism in asthma susceptibility. METHODS To assess genetic association with asthma phenotypes, we genotyped 341 Caucasian families (containing two asthmatic siblings) and non-asthmatic control subjects (n=184). Genetic association was determined by case-control and transmission disequilibrium test (TDT) analyses. To determine the functional role of polymorphisms on basal transcription, we generated ALOX5AP-promoter-luciferase constructs and transiently transfected human HeLa cells. RESULTS A novel G/A substitution at -336 bp and a poly(A) repeat (n=19 or 23) at position -169 to -146 bp were identified in the ALOX5AP promoter. Genotyping found the -336 A and poly(A19) alleles at frequencies of q=0.06 and 0.12, respectively. No ALOX5AP allele was associated with asthma or asthma-related phenotypes in case-control or TDT analyses. ALOX5AP-promoter-luciferase analyses did not support a functional role of the -336 or poly(A) polymorphism in determining basal transcription. The ALOX5 Sp1 polymorphism was predominantly homozygous wild-type 5/5 (frequency q=0.70) and heterozygous 4/5 (q=0.23) genotypes and no allele was associated with asthma or asthma-related phenotypes. CONCLUSION Taken together, these data do not support a significant role for these polymorphisms in genetic susceptibility to asthma in the Caucasian population.
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135
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Beghé B, Barton S, Rorke S, Peng Q, Sayers I, Gaunt T, Keith TP, Clough JB, Holgate ST, Holloway JW. Polymorphisms in the interleukin-4 and interleukin-4 receptor alpha chain genes confer susceptibility to asthma and atopy in a Caucasian population. Clin Exp Allergy 2003; 33:1111-7. [PMID: 12911786 DOI: 10.1046/j.1365-2222.2003.01731.x] [Citation(s) in RCA: 101] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
BACKGROUND IL-4 by binding to its receptor (IL-4R) is essential for the development of airway inflammation present in asthma, through the induction of IgE synthesis in B cells and differentiation of T cells to a Th2 phenotype. OBJECTIVE To investigate the role of four common polymorphisms in the IL-4 (IL4-34CT and IL4-589CT) and IL-4Ralpha chain (IL4RAI50V and IL4RAQ576R) genes in conferring susceptibility to the development of atopy and/or asthma. METHODS Two polymorphisms in the IL-4 gene promoter, IL4-34CT and IL4-589CT, and two polymorphisms in the IL-4Ralpha chain gene, IL4RAI50V and IL4RAQ576R, have been genotyped using PCR-based methods in 341 asthmatic families and in 184 non-asthmatic adults recruited from the south of England. RESULTS Case-control analysis did not reveal differences in the distribution of the four polymorphisms between asthmatics and controls. However, the transmission disequilibrium test showed that the IL4-589 T allele was preferentially transmitted to asthmatic children (P=0.036) and that the IL4RAQ576 was preferentially transmitted to children with atopic asthma (P=0.018). Haplotype analysis showed a strong association between the IL4-34T/-589T haplotype and asthma per se (P=0.041), and a strong association between the IL4RA I50/Q576 haplotype and atopic asthma (P=0.006). CONCLUSION Our data suggest that polymorphisms in the IL-4 and IL-4Ralpha chain genes might play a role both conferring susceptibility to and modulating severity of atopy and asthma.
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136
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Sullards MC, Wang E, Peng Q, Merrill AH. Metabolomic profiling of sphingolipids in human glioma cell lines by liquid chromatography tandem mass spectrometry. Cell Mol Biol (Noisy-le-grand) 2003; 49:789-97. [PMID: 14528916] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/27/2023]
Abstract
Sphingolipids participate in membrane structure and signaling in neuronal cells, and an emerging strategy for control of gliomas is to inhibit growth and/or induce apoptosis using ceramide and ceramide analogs. Nonetheless, some sphingolipids (ceramides and sphingosine) induce and others (sphingosine 1-phosphate) inhibit apoptosis; therefore, when testing putative anti-cancer agents, it is critical to obtain precise knowledge of the types and quantities of not only the test compounds, but also their effects on endogenous species. Combination of liquid chromatography and tandem mass spectrometry affords a "metabolomic" profile of all of the intermediates of ceramide biosynthesis (3-ketosphinganine, sphinganine and dihydroceramides) and the direct products of ceramide metabolism (sphingomyelins and monohexosylceramides as well as sphingosine and sphingosine 1-phosphate). This method has been applied to four human glioma cell lines (LN18, LN229, LN319 and T98G), and differences in the amounts and types of sphingolipids were found. For example, LN229 and LN319 have approximately twice the sphingosine 1-phosphate of LN18 and T98G; LN229 and LN319 have more monohexosylceramides than lactosylceramides, whereas the opposite is the case for LN18 and T98G; and the fatty acyl chain distributions of the sphingolipids differ among the cell lines. The ability to obtain this type of "metabolomic" profile allows studies of how anti-cancer agents (especially sphingolipids and sphingolipid analogs) affect the amounts of these bioactive species, and may lead to a better understanding of the abnormal phenotypes of gliomas.
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137
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Bennett GW, Bousquet B, Brown HN, Bunce G, Carey RM, Cushman P, Danby GT, Debevec PT, Deile M, Deng H, Deninger W, Dhawan SK, Druzhinin VP, Duong L, Efstathiadis E, Farley FJM, Fedotovich GV, Giron S, Gray FE, Grigoriev D, Grosse-Perdekamp M, Grossmann A, Hare MF, Hertzog DW, Huang X, Hughes VW, Iwasaki M, Jungmann K, Kawall D, Khazin BI, Kindem J, Krienen F, Kronkvist I, Lam A, Larsen R, Lee YY, Logashenko I, McNabb R, Meng W, Mi J, Miller JP, Morse WM, Nikas D, Onderwater CJG, Orlov Y, Ozben CS, Paley JM, Peng Q, Polly CC, Pretz J, Prigl R, Zu Putlitz G, Qian T, Redin SI, Rind O, Roberts BL, Ryskulov N, Shagin P, Semertzidis YK, Shatunov YM, Sichtermann EP, Solodov E, Sossong M, Steinmetz A, Sulak LR, Trofimov A, Urner D, Von Walter P, Warburton D, Yamamoto A. Measurement of the positive muon anomalous magnetic moment to 0.7 ppm. PHYSICAL REVIEW LETTERS 2002; 89:101804. [PMID: 12225185 DOI: 10.1103/physrevlett.89.101804] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2002] [Indexed: 05/23/2023]
Abstract
A higher precision measurement of the anomalous g value, a(mu)=(g-2)/2, for the positive muon has been made at the Brookhaven Alternating Gradient Synchrotron, based on data collected in the year 2000. The result a(mu(+))=11 659 204(7)(5)x10(-10) (0.7 ppm) is in good agreement with previous measurements and has an error about one-half that of the combined previous data. The present world average experimental value is a(mu)(expt)=11 659 203(8)x10(-10) (0.7 ppm).
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138
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Peng Q, Groebner R, Lao L, Schachter J, Schissel D, Wade M. Status of the Linux PC cluster for between-pulse data analyses at DIII-D. FUSION ENGINEERING AND DESIGN 2002. [DOI: 10.1016/s0920-3796(02)00027-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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139
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Schissel D, Finkelstein A, Foster I, Fredian T, Greenwald M, Hansen C, Johnson C, Keahey K, Klasky S, Li K, McCune D, Peng Q, Stevens R, Thompson M. Data management, code deployment, and scientific visualization to enhance scientific discovery in fusion research through advanced computing. FUSION ENGINEERING AND DESIGN 2002. [DOI: 10.1016/s0920-3796(02)00050-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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140
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Schmidbauer JM, Apple DJ, Peng Q, Arthur SN, Vargas LG. [Cloudiness of a PMMA intraocular lens. "Snowflake" degeneration]. Ophthalmologe 2002; 99:306-7. [PMID: 12058511 DOI: 10.1007/s003470100492] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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141
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Arthur S, Steed LL, Apple DJ, Peng Q, Howard G, Escobar-Gomez M. Scedosporium prolificans keratouveitis in association with a contact lens retained intraocularly over a long term. J Clin Microbiol 2001; 39:4579-82. [PMID: 11724890 PMCID: PMC88594 DOI: 10.1128/jcm.39.12.4579-4582.2001] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Scedosporium prolificans is a soil saprophyte that is associated with a large variety of infectious processes and with respiratory colonization in immunocompetent and immunocompromised patients. We report the first described case of S. prolificans keratouveitis associated with the intraocular long-term retention of a contact lens in a 76-year-old female patient.
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Wu GJ, Wu MW, Wang SW, Liu Z, Qu P, Peng Q, Yang H, Varma VA, Sun QC, Petros JA, Lim SD, Amin MB. Isolation and characterization of the major form of human MUC18 cDNA gene and correlation of MUC18 over-expression in prostate cancer cell lines and tissues with malignant progression. Gene 2001; 279:17-31. [PMID: 11722842 DOI: 10.1016/s0378-1119(01)00736-3] [Citation(s) in RCA: 74] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
Ectopical expression of huMUC18, a cell adhesion molecule in the immunoglobulin gene superfamily, causes a non-metastatic human melanoma cell line to become metastatic in a nude mouse system. To determine if MUC18 expression correlates with the development and malignant progression of prostate cancer, we investigated differential expression of human MUC18 (huMUC18) in normal prostate epithelial cells, prostate cancer cell lines, and prostatic normal and cancer tissues. We cloned and characterized the human MUC18 (huMUC18) cDNA gene from three human prostate cancer cell lines and three human melanoma cell lines. The cDNA sequences from the six human cancer cell lines were identical except differences in one to five nucleotides. The deduced amino acid sequences of the longest ORF were 646 amino acids that were identical in these cDNAs except for one to three amino acid residues. The amino acid sequences of all our huMUC18 cDNA genes are similar to that cloned by other group (GenBank access #M28882) except differences in the same seven amino acids. We conclude that huMUC18 cDNA gene reported here represents the gene product from a major allele. The MUC18 mRNA and protein was expressed in three metastatic prostate cancer cell lines (TSU-PR1, DU145, and PC-3), but not in one non-metastatic prostate cancer cell line (LNCaP.FGC). The expression of huMUC18 in these four cell lines is positively related to their extent of in vitro motility and invasiveness and in vivo metastasis in nude mice. HuMUC18 protein was also expressed at high levels in extracts prepared from tissue sample sections containing high grade prostatic intraepithelial neoplasia (PIN), but weakly expressed in extracts prepared from cultured primary normal prostatic epithelial cells and the normal prostate gland. Immunohistochemical analysis showed that huMUC18 was expressed at higher levels in the epithelial cells of high-grade PIN and prostatic carcinomas, and in cells of a perineural invasion, a lymph node, and a lung metastases compared to that in normal or benign hyperplastic epithelium (BPH). We therefore conclude that MUC18 expression is increased during prostate cancer initiation (high grade PIN) and progression to carcinoma, and in metastatic cell lines and metastatic carcinoma. Increased expression of MUC18 is implicated to play an important role in developing and malignant progression of human prostate cancer. Furthermore, the lacking of predominant cytoplasmic membrane expression of MUC18 appeared to correlate with malignant progression of prostate cancer.
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MESH Headings
- Amino Acid Sequence
- Antigens, CD
- Antigens, Surface/genetics
- Antigens, Surface/metabolism
- Base Sequence
- CD146 Antigen
- Cell Membrane/metabolism
- Cell Movement
- Cytoplasm/metabolism
- DNA, Complementary/chemistry
- DNA, Complementary/genetics
- DNA, Complementary/isolation & purification
- Disease Progression
- Gene Expression Regulation, Neoplastic
- Humans
- Immunohistochemistry
- Male
- Melanoma/genetics
- Melanoma/pathology
- Membrane Glycoproteins
- Molecular Sequence Data
- Neoplasm Invasiveness
- Neural Cell Adhesion Molecules
- Prostate/chemistry
- Prostate/cytology
- Prostate/metabolism
- Prostatic Neoplasms/genetics
- Prostatic Neoplasms/pathology
- RNA, Messenger/genetics
- RNA, Messenger/metabolism
- Reverse Transcriptase Polymerase Chain Reaction
- Sequence Alignment
- Sequence Analysis, DNA
- Sequence Homology, Amino Acid
- Tumor Cells, Cultured
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143
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Schmidbauer JM, Apple DJ, Auffarth GU, Peng Q, Pandey SK, Werner L, Escobar-Gomez M, Vargas LG. [Complication profiles of posterior chamber intraocular lenses IOL). An analysis of 586 foldable and 2077 rigid explanted intraocular lenses]. Ophthalmologe 2001; 98:1029-35. [PMID: 11729733 DOI: 10.1007/s003470170021] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
BACKGROUND Foldable intraocular lenses (IOL) have become increasingly preferred choice for IOL implantation after cataract removal. However, both foldable as well as rigid IOLs are not yet complication-free and may need explanation. MATERIAL AND METHODS A total of 2663 explanted posterior chamber IOLs (PCIOLs) were accessioned at the Center for Research on Ocular Therapeutics and Biodevices between January 1988 and September 2000. The lenses were examined grossly using a Leitz/Wild M-8-Zoom stereomicroscope. The clinical reasons for explanation were documented for foldable as well as for rigid lenses. RESULTS Of a total of 2663 explanted PCIOLs, 586 were foldable lenses and 2077 were rigid PMMA lenses The most frequent reason for explantation of all 2663 IOLs studied was decentration/dislocation. Optic and haptic damage and posterior capsule rupture were significantly more often a reason for explantation in several foldable designs compared to rigid PCIOLs. Whereas rigid designs lead more often to corneal decompensation. The percentage of explanted IOLs because of inflammatory reactions decreased significantly from 1994 to 2000. CONCLUSIONS The complication profiles of rigid and foldable IOLs revealed some apparent differences due to the nature of the IOL biomaterials and designs. IOL optic/haptic damage was a common complication for foldable IOLs, whereas it was only discovered in single digits for rigid PMMA IOLs. The possible explanation for this is, that the soft and flexible biomaterials, from which all the foldable IOLs were manufactured, are easier to be damaged during folding, unfolding and insertion procedure. In our opinion this relative disadvantage of foldable IOLs is by far outweighed by the numerous advantages of the small incision cataract surgery. The decreasing inflammatory reactions can be explained by advances in surgical techniques, especially the secure in-the-bag fixation of IOLs.
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144
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Peng Q. [A brief history of ophthalmology in the pre-Qin period] (Chi). ZHONGHUA YI SHI ZA ZHI (BEIJING, CHINA : 1980) 2001; 18:75-8. [PMID: 11621546] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/21/2023]
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145
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Vargas LG, Peng Q, Escobar-Gomez M, Schmidbauer JM, Apple DJ. Overview of modern foldable intraocular lenses and clinically relevant anatomy and histology of the crystalline lens. Int Ophthalmol Clin 2001; 41:1-15. [PMID: 11481534 DOI: 10.1097/00004397-200107000-00003] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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146
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Arthur SN, Peng Q, Escobar-Gomez M, Apple DJ. Silicone oil adherence to silicone intraocular lenses. Int Ophthalmol Clin 2001; 41:33-45. [PMID: 11481538 DOI: 10.1097/00004397-200107000-00005] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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147
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Peng Q, Apple DJ, Arthur SN, Merritt JH, Escobar-Gomez M, Hoddinott DS. Snowflake opacification of poly(methyl methacrylate) intraocular lens optic biomaterial: a newly described syndrome. Int Ophthalmol Clin 2001; 41:91-107. [PMID: 11481542 DOI: 10.1097/00004397-200107000-00009] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Schmidbauer JM, Vargas LG, Peng Q, Escobar-Gomez M, Werner L, Arthur SN, Apple DJ. Posterior capsule opacification. Int Ophthalmol Clin 2001; 41:109-31. [PMID: 11481543 DOI: 10.1097/00004397-200107000-00010] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Arthur SN, Peng Q, Apple DJ, Escobar-Gomez M, Bianchi R, Pandey SK, Werner L. Effect of heparin surface modification in reducing silicone oil adherence to various intraocular lenses. J Cataract Refract Surg 2001; 27:1662-9. [PMID: 11687368 DOI: 10.1016/s0886-3350(01)00891-4] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
PURPOSE To evaluate surface properties of various intraocular lenses (IOLs), including a newly fabricated heparin-surface-modified (HSM) silicone IOL, with special reference to their efficiency in reducing potential silicone oil adherence to the IOL optics. SETTING Center for Research on Ocular Therapeutics and Biodevices, Department of Ophthalmology, Storm Eye Institute, Medical University of South Carolina, Charleston, South Carolina, USA. METHODS Five groups of rigid and foldable IOLs were analyzed in an in vitro test for the percentage of silicone oil adherence: a single-piece foldable hydrophilic-acrylic IOL (n = 9); a single-piece rigid poly(methyl methacrylate) (PMMA) IOL with HSM coating of the lens optic (n = 9); a 3-piece foldable silicone optic IOL with HSM coating of the optic (n = 10); a single-piece standard rigid PMMA IOL (n = 7); and a standard 3-piece foldable silicone optic IOL (n = 9). After the IOLs were immersed in water and then in silicone oil, gross photographs taken. Image analysis was performed to evaluate the percentage of silicone oil coverage of the anterior and posterior surfaces of each IOL optic. RESULTS The mean silicone oil coverage of the hydrophilic-acrylic IOLs was 5.6% +/- 2.5% (SD); of the HSM PMMA IOLs, 6.2% +/- 4.3%; of the HSM silicone optic IOLs, 6.7% +/- 3.2%; and of the standard PMMA IOLs, 20.3% +/- 13.3%. The mean silicone oil coverage was greatest on the standard silicone optic IOLs, 98.2% +/- 3.1%. CONCLUSIONS Intraocular lenses with a hydrophilic optic have less tendency toward adherence to silicone oil than more hydrophobic designs. A foldable silicone IOL with heparin surface modification can significantly reduce potential silicone oil adherence, comparable to the level achievable with the rigid HSM PMMA designs. Two new foldable IOL styles, the HSM silicone IOL and IOLs in the general class of hydrophilic-acrylic, were highly efficacious in reducing silicone oil adherence. There is now a real choice of foldable lenses for patients with actual or potential vitreoretinal diseases.
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Schmidbauer JM, Vargas LG, Apple DJ, Auffarth GU, Peng Q, Arthur SN, Escobar-Gomez M. [Millenniums update on posterior capsule opacification (PCO) scores, centration, biocompatibility and fixation of foldable intraocular lenses (IOL) - an analysis of 1,221 pseudophakic post mortem globes]. Klin Monbl Augenheilkd 2001; 218:649-57. [PMID: 11706380 DOI: 10.1055/s-2001-18386] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
BACKGROUND The ongoing and fast evolution of foldable IOL designs established the necessity to evaluate the different abilities of each lens style. The large IOL database (over 16,500 specimens) acquired in our laboratory, has permitted us to perform a clinico-pathological analysis on pseudophakic autopsy globes provided from sources worldwide, especially many Lions Eye banks in the United States. MATERIAL AND METHODS We analyzed 6 foldable IOL styles commonly implanted in the United States, using one type of rigid IOL design (1-piece design rigid PMMA optics) as a comparison group. Posterior capsule opacification (PCO) score, decentration, fixation, presence or absence of a Nd:YAG laser posterior capsulotomy and area and intensity of Soemmerring's ring formation was discerned by examination under an operating microscope using the Miyake-Apple posterior photographic technique. RESULTS The four lenses with the lowest rates ranging between 3.8 % and 21.7 % are modern designs, mostly implanted after 1992. The two lenses with the higher rates ranging between 23.1 % and 30.4 %, were all older designs, already prevalent prior to 1992. IOL fixation with both haptics in the capsular bag showed the best centration values and PCO scores. Our studies to date have shown in a preliminary fashion that the AcrySoftrade mark IOL displays the the lowest (best) biocompatibility score. CONCLUSIONS Entering the new millenium, with evolution of modern surgical techniques and IOL designs, the incidence of the two major complications of cataract surgery, decentration and PCO are now finally diminishing.
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